I want to know where is the location of launch.conf in our whole environment because i have to edit the proxy server inside it.?
when you speak of launch.conf are you meaning splunk-launch.conf?
If yes, it must be on every Splunk server and it's located in $SPLUNK_HOME/etc.
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Do you mean all the including Deployement server , master, every search head and every indexer?
all the Splunk servers are the same installation but having different roles, this means that splunk-launch.conf is in the same position in all instances.
Anyway, follow the Splunk documentation (e.g. https://docs.splunk.com/Documentation/Splunk/7.3.2/Admin/ConfigureSplunkforproxy ) to understand what to set to use a proxy server.